Positive pressure blower and vacuum pump



W. E. CLARKE POSITIVE PRESSURE BLOWER AND VACUUM PUMR Filed Oct. 1926 Mfka/erf I van tor.

ranged as to provide for interfitting engagement on said axle, that is to say, the hub from one blade will be positioned between two hubs from the other blade, thus preventing distortion of said blades in relation to each other and consequently eliminating vibration and noise and also preventing said blades from binding on said axle.

Owing to the axis of the rotor 6 and the axle 9 on which the blades are mounted be ing eccentric in relation to each other it will be apparent that the angular relation of the blades to each other will be constantly changing throughout each revolution of said rotor and as a consequent the slots 13 must be of sufficient transverse diameter to permit of said blades working freely therein butat the same time there mustbe no appreciable clearance,.the presence of which would permit of vibration which would result in noise and wear and would also ,destroy the centrifugal balance of said blades,

In order to compensate for this variance in the angular relation between the blades said blades respectively are provided, at the points where they extend through the slots 13 in the rotor, with semi-circular protuberances, or bosses, 15 from opposite sides thereof, which, with said blades completely close said slots, thus effectually preventing any back flow of fluid, but owingvto the fact that the surfaces of said bosses which are in continuous engagement with the opposing walls of said slots are rounded, or otherwise shaped to present a transverse surface of less diameter than the thickness of the walls of said slots, the eccentric movement of said blades is not interfered with and as a consequence there is absolutely no danger of said blades binding in said slots, nor can there possibly be any friction.

In the operation of this invention, the air, or other fluid, enters the compression chamber 2 through the inlet 4 and is forced therearound and outwardly. through the reduced end thereof by the rapidly rotating blades 11 and 12, and as the angular relations of the blades change in relation to each other the rounded surfaces of the enlargements 15 simply rotate on the respective faces of the slots 13, allowing the same freedom of movement of said blades as would obtainif clearance was allowed between the blades and the walls of the slots, butabsolutely preventing any back flow of liquid and also eliminating all vibrations, without friction.

What I claim is 1. In a positive pressure blower, the combination with a cylindrical casing, and a driven rotor rotatable within said casing on an axis eccentric to the axis of said casing, said rotor being provided with diametrically opposed blade slots, of blades rotatably mounted concentrically with said casing and extending through said slots respectively for running engagement with the interior periphery of said casing, said blades respectively being operated by the rotor and provided with opposedrelatively fixed lateral offsets constituting bearings adapted for ro tary engagement with the opposed faces of said slots respectively.

2. In a positive pressure blower, the combination with a casing and a centrifugally balanced power driven rotor mounted therein eccentric to the axis of said casing, said rotor having blade slots therein in equally spaced relation-to ,each other, of-blad-es rotatable on a common axis within said rotor and, concentric to saidcasing, said blades respectively being provided with integral opposed lateral bosses constituting bearings adapted for rotary engagement with the interior faces of said slots respectively, said bosses being of lesser transverse 'diameter than the width of said faces at the respective points of contact therewith.

3. In a positive pressure blower, the com I bination with a cylindrical casing having inlet and outlet, and a power driven rotor eccentrically mounted for rotation within said casing and in running engagement with that portion of the inner periphery of said casing between said inlet and outlet, said rotor being provided with blade slots in equally spaced relation to each other, of separately rotatable blades rotatable on a common axis of said casing and having 0pposed lateral enlargements constituting bearings adapted for rotative and longitudinal engagement/with the opposed faces of said slots respectively, said enlargements being semi-circular in cross section.

4. A positive pressure blower comprising a circular casing having inlet and outlet, a

fixed shaft mounted in said casing and concentric to the axis thereof, a driven rotor mounted eccentrically within said casing and operating around said shaft, said rotor being provided with blade slots at regularly spaced intervals there-around, the walls of said slots being parallel to a line drawn transversely through the axis of said shaft, and separately rotatable blades mounted on said fixed shaft in interfitting engagement with each other and extending through said slots respectively and having running engagement with the inner periphery of said casing, said blades serving to close said blade slots against fluid passage and being mounted for longitudinal and rotative bearing with respect to the walls of the slots.

5. A positive pressure blower comprising and of said casing and rotating around said shaft in eccentric relation to the axis of mid casing, and separately rotatable blades having huh extension? mounted for tree rotation on said tixed shaft, said blades i \iendin through the slots in said rotor and lining provided with opposed lateral relatively fixed ofi'rets adapted to clone the space in Silld slots at each RHlQ of said blades respectively and permitting of angular movement 10 A ugust 1926.

\VILLI A M E. C LA RKE. 

